摘要
针对常压塔塔顶封头焊缝下沿处的开裂问题,探讨了316L不锈钢(塔体主要材质)在H_(2)S-HCl-H_(2)O环境下的腐蚀机理。利用慢应变率拉伸试验和扫描电子显微镜(SEM),分析H_(2)S、Cl−浓度以及pH值对316L不锈钢在H_(2)S-HCl-H_(2)O环境中应力腐蚀敏感性的影响。同时,改进了目前已有的有机硅涂层与聚四氟乙烯涂层,并通过耐高温试验、附着力测试和电化学评估,明确316L不锈钢在塔内工况下的高温稳定性和耐腐蚀性。结果表明,2种改进的涂层均具有优异的耐高温性和耐腐蚀性,可以有效防止常压塔封头裂纹的扩展。
To address the cracking issue at the weld line of the dome in a pressure tower,this study investigates the corrosion mechanism of the tower material,316L stainless steel,in an H_(2)S-HCl-H_(2)O environment.The primary material of the tower,austenitic stainless steel 316L,was selected as the research subject.Using slow strain rate tensile testing and scanning electron microscopy(SEM),the effects of H_(2)S,chloride concentration,and pH on the stress corrosion sensitivity of 316L stainless steel in the H_(2)S-HCl-H_(2)O environment were analyzed.In addition,the existing silicone coatings and PTFE coatings were improved and subjected to high-temperature tests,adhesion tests and electrochemical evaluations to determine their high-temperature stability and corrosion resistance under the tower conditions.The results demonstrate that the two improved high-temperature coatings exhibit excellent high-temperature and corrosion resistance,effectively preventing the propagation of cracks in the pressure tower dome.
作者
李进
李之尚
金波
黄栩浩
周灏予
朱珏
LI Jin;LI Zhishang;JIN Bo;HUANG Xuhao;ZHOU Haoyu;ZHU Jue(Zhejiang Provincial Engineering Research Center for the Safety of Pressure Vessel and Pipeline,Ningbo 315211,China;Key Laboratory of Impact and Safety Engineering of Ministry of Education,Ningbo University,Ningbo 315211,China;China National Offshore Oil Corporation of Ningbo Daxie Petrochemical Co.,Ltd.,Ningbo 315812,China)
出处
《宁波大学学报(理工版)》
2025年第4期56-66,共11页
Journal of Ningbo University:Natural Science and Engineering Edition
基金
国家自然科学基金(11972203,11572162,12102214)
宁波市“科创甬江2035”关键技术突破计划项目(2024Z256)
宁波市“科技创新2025”重大专项(2022Z209)
宁波市自然科学基金(202003N4152,2022J128)。
关键词
316L不锈钢
应力腐蚀
电化学
涂层防护
316L stainless steel
stress corrosion
electrochemistry
coating protection
